package cn.edu.sdjzu.xg.kcsj.security;

import cn.edu.sdjzu.xg.kcsj.domain.Faculty;
import cn.edu.sdjzu.xg.kcsj.exception.BysjException;
import cn.edu.sdjzu.xg.kcsj.util.JdbcHelper;
import cn.edu.sdjzu.xg.kcsj.util.Pagination;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collection;
import java.util.List;
import java.util.TreeSet;

public class ResourceService {
    private static ResourceDao resourceDao = ResourceDao.getInstance();
    private static ResourceService resourceService = new ResourceService();

    public static ResourceService getInstance(){
        return resourceService;
    }

    // 查找全部院系
    public Collection<Resource> findAll(List conditionList, Pagination pagination) throws SQLException {
        Connection connection = JdbcHelper.getConn();
        //将自动提交设为false,开始事务
        connection.setAutoCommit(false);
        Collection<Resource> resources = new TreeSet<Resource>();
        try {
            resources = resourceDao.findAll(conditionList,pagination,connection);
            //提交事务
            connection.commit();
        }catch (SQLException e){
            //回滚
            connection.rollback();
        }finally {
            //将自动提交设为true，结束事务
            connection.setAutoCommit(true);
            JdbcHelper.close(connection);
        }
        return resources;
    }

    // 按id查找院系
    public Resource find(Integer id) throws SQLException {
        Connection connection = JdbcHelper.getConn();
        //将自动提交设为false,开始事务
        connection.setAutoCommit(false);
        Resource resource = null;
        try {
            resource = resourceDao.find(id,connection);
            //提交事务
            connection.commit();
        }catch (SQLException e){
            //回滚
            connection.rollback();
        }finally {
            //将自动提交设为true，结束事务
            connection.setAutoCommit(true);
            JdbcHelper.close(connection);
        }
        return resource;
    }

    // 更新一条
    public boolean update(Resource resource) throws SQLException {
        Connection connection = JdbcHelper.getConn();
        //将自动提交设为false,开始事务
        connection.setAutoCommit(false);
        Boolean updated =false;
        try {
            updated = resourceDao.update(resource,connection);
            //提交事务
            connection.commit();
        }catch (SQLException e){
            //回滚
            connection.rollback();
        }finally {
            //将自动提交设为true，结束事务
            connection.setAutoCommit(true);
            JdbcHelper.close(connection);
        }
        return updated;
    }

    public boolean add(Resource resource) throws SQLException {
        Connection connection = JdbcHelper.getConn();
        //将自动提交设为false,开始事务
        connection.setAutoCommit(false);
        Boolean added =false;
        try {
            //增加
            added = resourceDao.add(resource,connection);
            //提交事务
            connection.commit();
        }catch (SQLException e){
            //回滚
            connection.rollback();

        }finally {
            //将自动提交设为true，结束事务
            connection.setAutoCommit(true);
            JdbcHelper.close(connection);
        }
        return added ;
    }

    // 删除
    public boolean delete(Integer id) throws SQLException, BysjException {
        Connection connection = JdbcHelper.getConn();
        //将自动提交设为false,开始事务
        connection.setAutoCommit(false);
        Boolean deleted = false;
        try {
            // 如果有子节点
            if(resourceDao.find(id,connection).getIsChild() == 1){
                throw new BysjException("存在下属系，不能删除！");
            }else {
                deleted = resourceDao.delete(id, connection);
                //提交事务
                connection.commit();
            }
        } catch (SQLException e) {
            //回滚
            connection.rollback();
        } finally {
            //将自动提交设为true，结束事务
            connection.setAutoCommit(true);
            JdbcHelper.close(connection);
        }
        return deleted;
    }

}
